Question 500958
x= $50, y = $20

50x+20y=400
/10
5x+2y=80
2y=-5x+80
y=(-5/2)x+40 equation in slope intercept form

x	0	2	-2	-4	-6
y=	40	35	45	50	55

{{{drawing(500,500,-5,20,-10,60,grid(1),circle(0,40,0.3),circle(2,35,0.3),circle(-2,45,0.3),circle(-4,50,0.3),graph(500,500,-5,20,-10,60,y=(-5x/2)+40))}}}


You can see from graph x= $50, y=$20
x=10,y=15
x=14,y=5
x=8,y=20